Messages in this thread | | | Date | Fri, 4 Jan 2002 11:40:47 -0600 (CST) | From | Jesse Pollard <> | Subject | Re: Two hdds on one channel - why so slow? |
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> > In article <200201041402.IAA80257@tomcat.admin.navo.hpc.mil> you wrote: > > In my experience, SCSI is not cost effective for systems with a single disk. > > As soon as you go to 4 or more disks, the throughput of SCSI takes over unless > > you are expanding a pre-existing workstation configuration. > > IDE Scales fine to 8 Channels (aka 8 Drives). Anything more than 8 Drives on > an HBA is insane anyway. > > I love the FC-to-IDE(8) Solution. You get Hardware Raid with 8 Channels, each > drive a didicated channel, thats much more reliable than usual 2 or 3 channel > SCSI Configurations. > > Do you realy run more than say 10 hard disk devices on a single SCSI Bus, > ever?
Only place I've seen that (not sure it was true SCSI though) was on a Cray file server - each target (4) was itself a raid 5, with 5 transports. That would be total of 20 disks. The four targets were striped together in software to form a single filesystem. I think that was our first over 300GB filesystem (several years ago). Now we are using 1 TB to 5TB filesystems with nearly 5 million files each.
------------------------------------------------------------------------- Jesse I Pollard, II Email: pollard@navo.hpc.mil
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